More LVGL UI code reduction (#19879)

Marlin/src/lcd/extui/lib/mks_ui/SPIFlashStorage.cpp

@@ -185,7 +185,7 @@ void SPIFlashStorage::loadPage(uint8_t* buffer) {
   // char fname[256];
   // snprintf(fname, sizeof(fname), "./pages/page-%03d.data", m_currentPage);
   // FILE *fp = fopen(fname, "rb");
-  // if (fp != nullptr) {
+  // if (fp) {
   //     fread(buffer, 1, SPI_FLASH_PageSize, fp);
   //     fclose(fp);
   // }

Marlin/src/lcd/extui/lib/mks_ui/draw_about.cpp

@@ -49,17 +49,7 @@ static void event_handler(lv_obj_t *obj, lv_event_t event) {
 }
 
 void lv_draw_about(void) {
-  if (disp_state_stack._disp_state[disp_state_stack._disp_index] != ABOUT_UI) {
+  scr = lv_screen_create(ABOUT_UI);
-    disp_state_stack._disp_index++;
-    disp_state_stack._disp_state[disp_state_stack._disp_index] = ABOUT_UI;
-  }
-  disp_state = ABOUT_UI;
-
-  scr = lv_screen_create();
-
-  (void)lv_label_create(scr, TITLE_XPOS, TITLE_YPOS, creat_title_text());
-
-  lv_refr_now(lv_refr_get_disp_refreshing());
 
   // Create an Image button
   lv_obj_t *buttonBack = lv_imgbtn_create(scr, "F:/bmp_return.bin", BTN_X_PIXEL * 3 + INTERVAL_V * 4, BTN_Y_PIXEL + INTERVAL_H + titleHeight, event_handler, ID_A_RETURN);

Marlin/src/lcd/extui/lib/mks_ui/draw_acceleration_settings.cpp

@@ -108,16 +108,7 @@ static void event_handler(lv_obj_t *obj, lv_event_t event) {
 }
 
 void lv_draw_acceleration_settings(void) {
-  if (disp_state_stack._disp_state[disp_state_stack._disp_index] != ACCELERATION_UI) {
+  scr = lv_screen_create(ACCELERATION_UI, machine_menu.AccelerationConfTitle);
-    disp_state_stack._disp_index++;
-    disp_state_stack._disp_state[disp_state_stack._disp_index] = ACCELERATION_UI;
-  }
-  disp_state = ACCELERATION_UI;
-
-  scr = lv_screen_create();
-
-  (void)lv_label_create(scr, TITLE_XPOS, TITLE_YPOS, machine_menu.AccelerationConfTitle);
-  lv_refr_now(lv_refr_get_disp_refreshing());
 
   if (uiCfg.para_ui_page != 1) {
     sprintf_P(public_buf_l, PSTR("%.1f"), planner.settings.acceleration);

Marlin/src/lcd/extui/lib/mks_ui/draw_advance_settings.cpp

@@ -40,6 +40,7 @@ enum {
 };
 
 static void event_handler(lv_obj_t *obj, lv_event_t event) {
+  if (event != LV_EVENT_RELEASED) return;
   switch (obj->mks_obj_id) {
     case ID_ADVANCE_RETURN:
       lv_clear_advance_settings();
@@ -69,17 +70,7 @@ static void event_handler(lv_obj_t *obj, lv_event_t event) {
 }
 
 void lv_draw_advance_settings(void) {
-  if (disp_state_stack._disp_state[disp_state_stack._disp_index] != ADVANCED_UI) {
+  scr = lv_screen_create(ADVANCED_UI, machine_menu.AdvancedConfTitle);
-    disp_state_stack._disp_index++;
-    disp_state_stack._disp_state[disp_state_stack._disp_index] = ADVANCED_UI;
-  }
-  disp_state = ADVANCED_UI;
-
-  scr = lv_screen_create();
-
-  (void)lv_label_create(scr, TITLE_XPOS, TITLE_YPOS, machine_menu.AdvancedConfTitle);
-
-  lv_refr_now(lv_refr_get_disp_refreshing());
 
   int index = 0;
   lv_screen_menu_item(scr, machine_menu.PausePosition, PARA_UI_POS_X, PARA_UI_POS_Y, event_handler, ID_PAUSE_POS, index++);

Marlin/src/lcd/extui/lib/mks_ui/draw_auto_level_offset_settings.cpp

@@ -65,17 +65,7 @@ static void event_handler(lv_obj_t *obj, lv_event_t event) {
 }
 
 void lv_draw_auto_level_offset_settings(void) {
-  if (disp_state_stack._disp_state[disp_state_stack._disp_index] != NOZZLE_PROBE_OFFSET_UI) {
+  scr = lv_screen_create(NOZZLE_PROBE_OFFSET_UI, machine_menu.OffsetConfTitle);
-    disp_state_stack._disp_index++;
-    disp_state_stack._disp_state[disp_state_stack._disp_index] = NOZZLE_PROBE_OFFSET_UI;
-  }
-  disp_state = NOZZLE_PROBE_OFFSET_UI;
-
-  scr = lv_screen_create();
-
-  (void)lv_label_create(scr, TITLE_XPOS, TITLE_YPOS, machine_menu.OffsetConfTitle);
-
-  lv_refr_now(lv_refr_get_disp_refreshing());
 
   sprintf_P(public_buf_l, PSTR("%.1f"), TERN(HAS_PROBE_XY_OFFSET, probe.offset.x, 0));
   lv_screen_menu_item_1_edit(scr, machine_menu.Xoffset, PARA_UI_POS_X, PARA_UI_POS_Y, event_handler, ID_OFFSET_X, 0, public_buf_l);

Marlin/src/lcd/extui/lib/mks_ui/draw_baby_stepping.cpp

@@ -112,18 +112,7 @@ static void event_handler(lv_obj_t *obj, lv_event_t event) {
 }
 
 void lv_draw_baby_stepping(void) {
-  if (disp_state_stack._disp_state[disp_state_stack._disp_index] != BABY_STEP_UI) {
+  scr = lv_screen_create(BABY_STEP_UI);
-    disp_state_stack._disp_index++;
-    disp_state_stack._disp_state[disp_state_stack._disp_index] = BABY_STEP_UI;
-  }
-  disp_state = BABY_STEP_UI;
-
-  scr = lv_screen_create();
-
-  (void)lv_label_create(scr, TITLE_XPOS, TITLE_YPOS, creat_title_text());
-
-  lv_refr_now(lv_refr_get_disp_refreshing());
-
   lv_big_button_create(scr, "F:/bmp_xAdd.bin", move_menu.x_add, INTERVAL_V, titleHeight, event_handler, ID_BABY_STEP_X_P);
   lv_big_button_create(scr, "F:/bmp_xDec.bin", move_menu.x_dec, INTERVAL_V, BTN_Y_PIXEL + INTERVAL_H + titleHeight, event_handler, ID_BABY_STEP_X_N);
   lv_big_button_create(scr, "F:/bmp_yAdd.bin", move_menu.y_add, BTN_X_PIXEL + INTERVAL_V * 2, titleHeight, event_handler, ID_BABY_STEP_Y_P);

Marlin/src/lcd/extui/lib/mks_ui/draw_change_speed.cpp

@@ -126,18 +126,7 @@ static void event_handler(lv_obj_t *obj, lv_event_t event) {
 }
 
 void lv_draw_change_speed(void) {
-  if (disp_state_stack._disp_state[disp_state_stack._disp_index] != CHANGE_SPEED_UI) {
+  scr = lv_screen_create(CHANGE_SPEED_UI);
-    disp_state_stack._disp_index++;
-    disp_state_stack._disp_state[disp_state_stack._disp_index] = CHANGE_SPEED_UI;
-  }
-  disp_state = CHANGE_SPEED_UI;
-
-  scr = lv_screen_create();
-
-  (void)lv_label_create(scr, TITLE_XPOS, TITLE_YPOS, creat_title_text());
-
-  lv_refr_now(lv_refr_get_disp_refreshing());
-
   // Create an Image button
   lv_big_button_create(scr, "F:/bmp_Add.bin", speed_menu.add, INTERVAL_V, titleHeight, event_handler, ID_C_ADD);
   lv_big_button_create(scr, "F:/bmp_Dec.bin", speed_menu.dec, BTN_X_PIXEL * 3 + INTERVAL_V * 4, titleHeight, event_handler, ID_C_DEC);

Marlin/src/lcd/extui/lib/mks_ui/draw_dialog.cpp

@@ -211,19 +211,8 @@ static void btn_cancel_event_cb(lv_obj_t *btn, lv_event_t event) {
 
 void lv_draw_dialog(uint8_t type) {
   lv_obj_t *btnOk = nullptr, *btnCancel = nullptr;
-  if (disp_state_stack._disp_state[disp_state_stack._disp_index] != DIALOG_UI) {
-    disp_state_stack._disp_index++;
-    disp_state_stack._disp_state[disp_state_stack._disp_index] = DIALOG_UI;
-  }
-  disp_state = DIALOG_UI;
-
   uiCfg.dialogType = type;
-
+  scr = lv_screen_create(DIALOG_UI);
-  scr = lv_screen_create();
-
-  (void)lv_label_create(scr, TITLE_XPOS, TITLE_YPOS, creat_title_text());
-
-  lv_refr_now(lv_refr_get_disp_refreshing());
 
   lv_obj_t *labelDialog = lv_label_create_empty(scr);
 

Marlin/src/lcd/extui/lib/mks_ui/draw_eeprom_settings.cpp

@@ -66,17 +66,7 @@ static void event_handler(lv_obj_t *obj, lv_event_t event) {
 }
 
 void lv_draw_eeprom_settings(void) {
-  if (disp_state_stack._disp_state[disp_state_stack._disp_index] != EEPROM_SETTINGS_UI) {
+  scr = lv_screen_create(EEPROM_SETTINGS_UI);
-    disp_state_stack._disp_index++;
-    disp_state_stack._disp_state[disp_state_stack._disp_index] = EEPROM_SETTINGS_UI;
-  }
-  disp_state = EEPROM_SETTINGS_UI;
-
-  scr = lv_screen_create();
-
-  (void)lv_label_create(scr, TITLE_XPOS, TITLE_YPOS, creat_title_text());
-  lv_refr_now(lv_refr_get_disp_refreshing());
-
   lv_screen_menu_item(scr, eeprom_menu.revert, PARA_UI_POS_X, PARA_UI_POS_Y, event_handler, ID_EEPROM_REVERT, 0);
   lv_screen_menu_item(scr, eeprom_menu.store, PARA_UI_POS_X, PARA_UI_POS_Y * 2, event_handler, ID_EEPROM_STORE, 1);
   lv_big_button_create(scr, "F:/bmp_back70x40.bin", common_menu.text_back, PARA_UI_BACL_POS_X, PARA_UI_BACL_POS_Y, event_handler, ID_EEPROM_RETURN, true);

Marlin/src/lcd/extui/lib/mks_ui/draw_encoder_settings.cpp

@@ -55,18 +55,8 @@ static void event_handler(lv_obj_t *obj, lv_event_t event) {
 }
 
 void lv_draw_encoder_settings(void) {
-  if (disp_state_stack._disp_state[disp_state_stack._disp_index] != ENCODER_SETTINGS_UI) {
+  scr = lv_screen_create(ENCODER_SETTINGS_UI, machine_menu.EncoderConfTitle);
-    disp_state_stack._disp_index++;
-    disp_state_stack._disp_state[disp_state_stack._disp_index] = ENCODER_SETTINGS_UI;
-  }
-  disp_state = ENCODER_SETTINGS_UI;
-
-  scr = lv_screen_create();
-  (void)lv_label_create(scr, TITLE_XPOS, TITLE_YPOS, machine_menu.EncoderConfTitle);
-  lv_refr_now(lv_refr_get_disp_refreshing());
-
   buttonEncoderState = lv_screen_menu_item_onoff(scr, machine_menu.EncoderConfText, PARA_UI_POS_X, PARA_UI_POS_Y, event_handler, ID_ENCODER_STATE, 0, gCfgItems.encoder_enable);
-
   lv_big_button_create(scr, "F:/bmp_back70x40.bin", common_menu.text_back, PARA_UI_BACL_POS_X, PARA_UI_BACL_POS_Y, event_handler, ID_ENCODER_RETURN, true);
 }
 

Marlin/src/lcd/extui/lib/mks_ui/draw_error_message.cpp

@@ -41,15 +41,8 @@ static lv_obj_t *scr;
 void lv_draw_error_message(PGM_P const msg) {
   #if 0
     static lv_obj_t *message = nullptr, *kill_message = nullptr, *reset_tips = nullptr;
-    if (disp_state_stack._disp_state[disp_state_stack._disp_index] != ERROR_MESSAGE_UI) {
-      disp_state_stack._disp_index++;
-      disp_state_stack._disp_state[disp_state_stack._disp_index] = ERROR_MESSAGE_UI;
-    }
-    disp_state = ERROR_MESSAGE_UI;
-
-    scr = lv_screen_create();
 
-    lv_refr_now(lv_refr_get_disp_refreshing());
+    scr = lv_screen_create(ERROR_MESSAGE_UI, "");
 
     if (msg) {
       message = lv_label_create(scr, msg);

Marlin/src/lcd/extui/lib/mks_ui/draw_extrusion.cpp

@@ -122,18 +122,7 @@ static void event_handler(lv_obj_t *obj, lv_event_t event) {
 }
 
 void lv_draw_extrusion(void) {
-  if (disp_state_stack._disp_state[disp_state_stack._disp_index] != EXTRUSION_UI) {
+  scr = lv_screen_create(EXTRUSION_UI);
-    disp_state_stack._disp_index++;
-    disp_state_stack._disp_state[disp_state_stack._disp_index] = EXTRUSION_UI;
-  }
-  disp_state = EXTRUSION_UI;
-
-  scr = lv_screen_create();
-
-  (void)lv_label_create(scr, TITLE_XPOS, TITLE_YPOS, creat_title_text());
-
-  lv_refr_now(lv_refr_get_disp_refreshing());
-
   // Create image buttons
   lv_obj_t *buttonAdd = lv_big_button_create(scr, "F:/bmp_in.bin", extrude_menu.in, INTERVAL_V, titleHeight, event_handler, ID_E_ADD);
   lv_obj_clear_protect(buttonAdd, LV_PROTECT_FOLLOW);

Marlin/src/lcd/extui/lib/mks_ui/draw_fan.cpp

@@ -89,18 +89,8 @@ void lv_draw_fan(void) {
   #if HAS_FAN
     fanSpeed = thermalManager.fan_speed[0];
   #endif
-  if (disp_state_stack._disp_state[disp_state_stack._disp_index] != FAN_UI) {
-    disp_state_stack._disp_index++;
-    disp_state_stack._disp_state[disp_state_stack._disp_index] = FAN_UI;
-  }
-  disp_state = FAN_UI;
-
-  scr = lv_screen_create();
-
-  (void)lv_label_create(scr, TITLE_XPOS, TITLE_YPOS, creat_title_text());
-
-  lv_refr_now(lv_refr_get_disp_refreshing());
 
+  scr = lv_screen_create(FAN_UI);
   // Create an Image button
   buttonAdd  = lv_big_button_create(scr, "F:/bmp_Add.bin", fan_menu.add, INTERVAL_V, titleHeight, event_handler, ID_F_ADD);
   lv_obj_clear_protect(buttonAdd, LV_PROTECT_FOLLOW);

Marlin/src/lcd/extui/lib/mks_ui/draw_filament_change.cpp

@@ -112,18 +112,7 @@ static void event_handler(lv_obj_t *obj, lv_event_t event) {
 }
 
 void lv_draw_filament_change(void) {
-  if (disp_state_stack._disp_state[disp_state_stack._disp_index] != FILAMENTCHANGE_UI) {
+  scr = lv_screen_create(FILAMENTCHANGE_UI);
-    disp_state_stack._disp_index++;
-    disp_state_stack._disp_state[disp_state_stack._disp_index] = FILAMENTCHANGE_UI;
-  }
-  disp_state = FILAMENTCHANGE_UI;
-
-  scr = lv_screen_create();
-
-  (void)lv_label_create(scr, TITLE_XPOS, TITLE_YPOS, creat_title_text());
-
-  lv_refr_now(lv_refr_get_disp_refreshing());
-
   // Create an Image button
   lv_obj_t *buttonIn = lv_big_button_create(scr, "F:/bmp_in.bin", filament_menu.in, INTERVAL_V, titleHeight, event_handler, ID_FILAMNT_IN);
   lv_obj_clear_protect(buttonIn, LV_PROTECT_FOLLOW);

Marlin/src/lcd/extui/lib/mks_ui/draw_filament_settings.cpp

@@ -89,17 +89,7 @@ static void event_handler(lv_obj_t *obj, lv_event_t event) {
 }
 
 void lv_draw_filament_settings(void) {
-  if (disp_state_stack._disp_state[disp_state_stack._disp_index] != FILAMENT_SETTINGS_UI) {
+  scr = lv_screen_create(FILAMENT_SETTINGS_UI, machine_menu.FilamentConfTitle);
-    disp_state_stack._disp_index++;
-    disp_state_stack._disp_state[disp_state_stack._disp_index] = FILAMENT_SETTINGS_UI;
-  }
-  disp_state = FILAMENT_SETTINGS_UI;
-
-  scr = lv_screen_create();
-
-  (void)lv_label_create(scr, TITLE_XPOS, TITLE_YPOS, machine_menu.FilamentConfTitle);
-
-  lv_refr_now(lv_refr_get_disp_refreshing());
 
   if (uiCfg.para_ui_page != 1) {
     sprintf_P(public_buf_l, PSTR("%d"), gCfgItems.filamentchange_load_length);

Marlin/src/lcd/extui/lib/mks_ui/draw_home.cpp

@@ -77,18 +77,7 @@ static void event_handler(lv_obj_t *obj, lv_event_t event) {
 }
 
 void lv_draw_home(void) {
-  if (disp_state_stack._disp_state[disp_state_stack._disp_index] != ZERO_UI) {
+  scr = lv_screen_create(ZERO_UI);
-    disp_state_stack._disp_index++;
-    disp_state_stack._disp_state[disp_state_stack._disp_index] = ZERO_UI;
-  }
-  disp_state = ZERO_UI;
-
-  scr = lv_screen_create();
-
-  (void)lv_label_create(scr, TITLE_XPOS, TITLE_YPOS, creat_title_text());
-
-  lv_refr_now(lv_refr_get_disp_refreshing());
-
   lv_big_button_create(scr, "F:/bmp_zeroAll.bin", home_menu.home_all, INTERVAL_V, titleHeight, event_handler, ID_H_ALL);
   lv_big_button_create(scr, "F:/bmp_zeroX.bin", home_menu.home_x, BTN_X_PIXEL + INTERVAL_V * 2, titleHeight, event_handler, ID_H_X);
   lv_big_button_create(scr, "F:/bmp_zeroY.bin", home_menu.home_y, BTN_X_PIXEL * 2 + INTERVAL_V * 3, titleHeight, event_handler, ID_H_Y);

Marlin/src/lcd/extui/lib/mks_ui/draw_homing_sensitivity_settings.cpp

@@ -75,15 +75,7 @@ static void event_handler(lv_obj_t *obj, lv_event_t event) {
 }
 
 void lv_draw_homing_sensitivity_settings(void) {
-  if (disp_state_stack._disp_state[disp_state_stack._disp_index] != HOMING_SENSITIVITY_UI) {
+  scr = lv_screen_create(HOMING_SENSITIVITY_UI, machine_menu.HomingSensitivityConfTitle);
-    disp_state_stack._disp_index++;
-    disp_state_stack._disp_state[disp_state_stack._disp_index] = HOMING_SENSITIVITY_UI;
-  }
-  disp_state = HOMING_SENSITIVITY_UI;
-
-  scr = lv_screen_create();
-  (void)lv_label_create(scr, TITLE_XPOS, TITLE_YPOS, machine_menu.HomingSensitivityConfTitle);
-  lv_refr_now(lv_refr_get_disp_refreshing());
 
   sprintf_P(public_buf_l, PSTR("%d"), TERN(X_SENSORLESS, stepperX.homing_threshold(), 0));
   lv_screen_menu_item_1_edit(scr, machine_menu.X_Sensitivity, PARA_UI_POS_X, PARA_UI_POS_Y, event_handler, ID_SENSITIVITY_X, 0, public_buf_l);

Marlin/src/lcd/extui/lib/mks_ui/draw_jerk_settings.cpp

@@ -71,15 +71,7 @@ static void event_handler(lv_obj_t *obj, lv_event_t event) {
 }
 
 void lv_draw_jerk_settings(void) {
-  if (disp_state_stack._disp_state[disp_state_stack._disp_index] != JERK_UI) {
+  scr = lv_screen_create(JERK_UI, machine_menu.JerkConfTitle);
-    disp_state_stack._disp_index++;
-    disp_state_stack._disp_state[disp_state_stack._disp_index] = JERK_UI;
-  }
-  disp_state = JERK_UI;
-
-  scr = lv_screen_create();
-  (void)lv_label_create(scr, TITLE_XPOS, TITLE_YPOS, machine_menu.JerkConfTitle);
-  lv_refr_now(lv_refr_get_disp_refreshing());
 
   sprintf_P(public_buf_l, PSTR("%.1f"), planner.max_jerk[X_AXIS]);
   lv_screen_menu_item_1_edit(scr, machine_menu.X_Jerk, PARA_UI_POS_X, PARA_UI_POS_Y, event_handler, ID_JERK_X, 0, public_buf_l);

Marlin/src/lcd/extui/lib/mks_ui/draw_keyboard.cpp

@@ -84,7 +84,7 @@ static void lv_kb_event_cb(lv_obj_t *kb, lv_event_t event) {
   if (lv_btnm_get_btn_ctrl(kb, btn_id, LV_BTNM_CTRL_NO_REPEAT) && event == LV_EVENT_LONG_PRESSED_REPEAT) return;
 
   const char * txt = lv_btnm_get_active_btn_text(kb);
-  if (txt == nullptr) return;
+  if (!txt) return;
 
   // Do the corresponding action according to the text of the button
   if (strcmp(txt, "abc") == 0) {
@@ -169,14 +169,13 @@ static void lv_kb_event_cb(lv_obj_t *kb, lv_event_t event) {
         default: break;
       }
     }
-    else {
+    else
-      lv_kb_set_ta(kb, nullptr); /*De-assign the text area to hide it cursor if needed*/
+      lv_kb_set_ta(kb, nullptr); // De-assign the text area to hide it cursor if needed
-    }
   return;
   }
 
   /*Add the characters to the text area if set*/
-  if (ext->ta == nullptr) return;
+  if (!ext->ta) return;
 
   if (strcmp(txt, "Enter") == 0 || strcmp(txt, LV_SYMBOL_NEW_LINE) == 0)
     lv_ta_add_char(ext->ta, '\n');
@@ -213,15 +212,7 @@ static void lv_kb_event_cb(lv_obj_t *kb, lv_event_t event) {
 }
 
 void lv_draw_keyboard() {
-  if (disp_state_stack._disp_state[disp_state_stack._disp_index] != KEY_BOARD_UI) {
+  scr = lv_screen_create(KEY_BOARD_UI, "");
-    disp_state_stack._disp_index++;
-    disp_state_stack._disp_state[disp_state_stack._disp_index] = KEY_BOARD_UI;
-  }
-  disp_state = KEY_BOARD_UI;
-
-  scr = lv_screen_create();
-
-  lv_refr_now(lv_refr_get_disp_refreshing());
 
   /*Create styles for the keyboard*/
   static lv_style_t rel_style, pr_style;

Marlin/src/lcd/extui/lib/mks_ui/draw_language.cpp

@@ -188,19 +188,7 @@ static void disp_language(uint8_t language, uint8_t state) {
 }
 
 void lv_draw_language(void) {
-
+  scr = lv_screen_create(LANGUAGE_UI);
-  if (disp_state_stack._disp_state[disp_state_stack._disp_index] != LANGUAGE_UI) {
-    disp_state_stack._disp_index++;
-    disp_state_stack._disp_state[disp_state_stack._disp_index] = LANGUAGE_UI;
-  }
-  disp_state = LANGUAGE_UI;
-
-  scr = lv_screen_create();
-
-  (void)lv_label_create(scr, TITLE_XPOS, TITLE_YPOS, creat_title_text());
-
-  lv_refr_now(lv_refr_get_disp_refreshing());
-
   // Create image buttons
   buttonCN = lv_big_button_create(scr, "F:/bmp_simplified_cn.bin", language_menu.chinese_s, INTERVAL_V, titleHeight, event_handler, ID_CN);
   lv_obj_clear_protect(buttonCN, LV_PROTECT_FOLLOW);
@@ -211,7 +199,6 @@ void lv_draw_language(void) {
   buttonFR = lv_big_button_create(scr, "F:/bmp_french.bin", language_menu.french, BTN_X_PIXEL + INTERVAL_V * 2, BTN_Y_PIXEL + INTERVAL_H + titleHeight, event_handler, ID_FR);
   buttonIT = lv_big_button_create(scr, "F:/bmp_italy.bin", language_menu.italy, BTN_X_PIXEL * 2 + INTERVAL_V * 3, BTN_Y_PIXEL + INTERVAL_H + titleHeight, event_handler, ID_IT);
   lv_big_button_create(scr, "F:/bmp_return.bin", common_menu.text_back, BTN_X_PIXEL * 3 + INTERVAL_V * 4, BTN_Y_PIXEL + INTERVAL_H + titleHeight, event_handler, ID_L_RETURN);
-
   disp_language(gCfgItems.language, SELECTED);
 }
 

Marlin/src/lcd/extui/lib/mks_ui/draw_level_settings.cpp

@@ -39,6 +39,7 @@ enum {
 };
 
 static void event_handler(lv_obj_t *obj, lv_event_t event) {
+  if (event != LV_EVENT_RELEASED) return;
   switch (obj->mks_obj_id) {
     case ID_LEVEL_RETURN:
       lv_clear_level_settings();
@@ -63,16 +64,7 @@ static void event_handler(lv_obj_t *obj, lv_event_t event) {
 }
 
 void lv_draw_level_settings(void) {
-  if (disp_state_stack._disp_state[disp_state_stack._disp_index] != LEVELING_PARA_UI) {
+  scr = lv_screen_create(LEVELING_PARA_UI, machine_menu.LevelingParaConfTitle);
-    disp_state_stack._disp_index++;
-    disp_state_stack._disp_state[disp_state_stack._disp_index] = LEVELING_PARA_UI;
-  }
-  disp_state = LEVELING_PARA_UI;
-
-  scr = lv_screen_create();
-  (void)lv_label_create(scr, TITLE_XPOS, TITLE_YPOS, machine_menu.LevelingParaConfTitle);
-  lv_refr_now(lv_refr_get_disp_refreshing());
-
   lv_screen_menu_item(scr, machine_menu.LevelingManuPosConf, PARA_UI_POS_X, PARA_UI_POS_Y, event_handler, ID_LEVEL_POSITION, 0);
   lv_screen_menu_item(scr, machine_menu.LevelingAutoCommandConf, PARA_UI_POS_X, PARA_UI_POS_Y * 2, event_handler, ID_LEVEL_COMMAND, 1);
   #if HAS_BED_PROBE

Marlin/src/lcd/extui/lib/mks_ui/draw_machine_para.cpp

@@ -66,17 +66,7 @@ static void event_handler(lv_obj_t *obj, lv_event_t event) {
 }
 
 void lv_draw_machine_para(void) {
-  if (disp_state_stack._disp_state[disp_state_stack._disp_index] != MACHINE_PARA_UI) {
+  scr = lv_screen_create(MACHINE_PARA_UI);
-    disp_state_stack._disp_index++;
-    disp_state_stack._disp_state[disp_state_stack._disp_index] = MACHINE_PARA_UI;
-  }
-  disp_state = MACHINE_PARA_UI;
-
-  scr = lv_screen_create();
-
-  (void)lv_label_create(scr, TITLE_XPOS, TITLE_YPOS, creat_title_text());
-  lv_refr_now(lv_refr_get_disp_refreshing());
-
   lv_screen_menu_item(scr, MachinePara_menu.MachineSetting, PARA_UI_POS_X, PARA_UI_POS_Y, event_handler, ID_PARA_MACHINE, 0);
   lv_screen_menu_item(scr, MachinePara_menu.MotorSetting, PARA_UI_POS_X, PARA_UI_POS_Y * 2, event_handler, ID_PARA_MOTOR, 1);
   lv_screen_menu_item(scr, MachinePara_menu.leveling, PARA_UI_POS_X, PARA_UI_POS_Y * 3, event_handler, ID_PARA_LEVEL, 2);

Marlin/src/lcd/extui/lib/mks_ui/draw_machine_settings.cpp

@@ -63,18 +63,7 @@ static void event_handler(lv_obj_t *obj, lv_event_t event) {
 }
 
 void lv_draw_machine_settings(void) {
-  if (disp_state_stack._disp_state[disp_state_stack._disp_index] != MACHINE_SETTINGS_UI) {
+  scr = lv_screen_create(MACHINE_SETTINGS_UI, machine_menu.MachineConfigTitle);
-    disp_state_stack._disp_index++;
-    disp_state_stack._disp_state[disp_state_stack._disp_index] = MACHINE_SETTINGS_UI;
-  }
-  disp_state = MACHINE_SETTINGS_UI;
-
-  scr = lv_screen_create();
-
-  (void)lv_label_create(scr, TITLE_XPOS, TITLE_YPOS, machine_menu.MachineConfigTitle);
-
-  lv_refr_now(lv_refr_get_disp_refreshing());
-
   lv_screen_menu_item(scr, machine_menu.AccelerationConf, PARA_UI_POS_X, PARA_UI_POS_Y, event_handler, ID_MACHINE_ACCELERATION, 0);
   lv_screen_menu_item(scr, machine_menu.MaxFeedRateConf, PARA_UI_POS_X, PARA_UI_POS_Y * 2, event_handler, ID_MACHINE_FEEDRATE, 1);
   #if HAS_CLASSIC_JERK

Marlin/src/lcd/extui/lib/mks_ui/draw_manuaLevel.cpp

@@ -118,16 +118,7 @@ static void event_handler(lv_obj_t *obj, lv_event_t event) {
 }
 
 void lv_draw_manualLevel(void) {
-  if (disp_state_stack._disp_state[disp_state_stack._disp_index] != LEVELING_UI) {
+  scr = lv_screen_create(LEVELING_UI);
-    disp_state_stack._disp_index++;
-    disp_state_stack._disp_state[disp_state_stack._disp_index] = LEVELING_UI;
-  }
-  disp_state = LEVELING_UI;
-
-  scr = lv_screen_create();
-  (void)lv_label_create(scr, TITLE_XPOS, TITLE_YPOS, creat_title_text());
-  lv_refr_now(lv_refr_get_disp_refreshing());
-
   // Create an Image button
   lv_obj_t *buttonPoint1 = lv_big_button_create(scr, "F:/bmp_leveling1.bin", leveling_menu.position1, INTERVAL_V, titleHeight, event_handler, ID_M_POINT1);
   lv_obj_clear_protect(buttonPoint1, LV_PROTECT_FOLLOW);

Marlin/src/lcd/extui/lib/mks_ui/draw_manual_level_pos_settings.cpp

@@ -121,15 +121,8 @@ static void event_handler(lv_obj_t *obj, lv_event_t event) {
 
 void lv_draw_manual_level_pos_settings(void) {
   char buf2[50];
-  if (disp_state_stack._disp_state[disp_state_stack._disp_index] != MANUAL_LEVELING_POSIGION_UI) {
-    disp_state_stack._disp_index++;
-    disp_state_stack._disp_state[disp_state_stack._disp_index] = MANUAL_LEVELING_POSIGION_UI;
-  }
-  disp_state = MANUAL_LEVELING_POSIGION_UI;
 
-  scr = lv_screen_create();
+  scr = lv_screen_create(MANUAL_LEVELING_POSIGION_UI, machine_menu.LevelingParaConfTitle);
-  (void)lv_label_create(scr, TITLE_XPOS, TITLE_YPOS, machine_menu.LevelingParaConfTitle);
-  lv_refr_now(lv_refr_get_disp_refreshing());
 
   if (uiCfg.para_ui_page != 1) {
     sprintf_P(public_buf_l, PSTR("%d"), gCfgItems.levelingPos[0][0]);

Marlin/src/lcd/extui/lib/mks_ui/draw_max_feedrate_settings.cpp

@@ -90,15 +90,7 @@ static void event_handler(lv_obj_t *obj, lv_event_t event) {
 }
 
 void lv_draw_max_feedrate_settings(void) {
-  if (disp_state_stack._disp_state[disp_state_stack._disp_index] != MAXFEEDRATE_UI) {
+  scr = lv_screen_create(MAXFEEDRATE_UI, machine_menu.MaxFeedRateConfTitle);
-    disp_state_stack._disp_index++;
-    disp_state_stack._disp_state[disp_state_stack._disp_index] = MAXFEEDRATE_UI;
-  }
-  disp_state = MAXFEEDRATE_UI;
-
-  scr = lv_screen_create();
-  (void)lv_label_create(scr, TITLE_XPOS, TITLE_YPOS, machine_menu.MaxFeedRateConfTitle);
-  lv_refr_now(lv_refr_get_disp_refreshing());
 
   if (uiCfg.para_ui_page != 1) {
     sprintf_P(public_buf_l, PSTR("%.1f"), planner.settings.max_feedrate_mm_s[X_AXIS]);

Marlin/src/lcd/extui/lib/mks_ui/draw_motor_settings.cpp

@@ -73,19 +73,9 @@ static void event_handler(lv_obj_t *obj, lv_event_t event) {
 }
 
 void lv_draw_motor_settings(void) {
-  if (disp_state_stack._disp_state[disp_state_stack._disp_index] != MOTOR_SETTINGS_UI) {
-    disp_state_stack._disp_index++;
-    disp_state_stack._disp_state[disp_state_stack._disp_index] = MOTOR_SETTINGS_UI;
-  }
-  disp_state = MOTOR_SETTINGS_UI;
-
-  scr = lv_screen_create();
-
-  (void)lv_label_create(scr, TITLE_XPOS, TITLE_YPOS, machine_menu.MotorConfTitle);
-
-  lv_refr_now(lv_refr_get_disp_refreshing());
-
   int index = 0;
+
+  scr = lv_screen_create(MOTOR_SETTINGS_UI, machine_menu.MotorConfTitle);
   lv_screen_menu_item(scr, machine_menu.StepsConf, PARA_UI_POS_X, PARA_UI_POS_Y, event_handler, ID_MOTOR_STEPS, index++);
   #if USE_SENSORLESS
     lv_screen_menu_item(scr, machine_menu.HomingSensitivityConf, PARA_UI_POS_X, PARA_UI_POS_Y * (index + 1), event_handler, ID_HOME_SENSE, index);

Marlin/src/lcd/extui/lib/mks_ui/draw_move_motor.cpp

@@ -115,18 +115,7 @@ static void event_handler(lv_obj_t *obj, lv_event_t event) {
 }
 
 void lv_draw_move_motor(void) {
-  if (disp_state_stack._disp_state[disp_state_stack._disp_index] != MOVE_MOTOR_UI) {
+  scr = lv_screen_create(MOVE_MOTOR_UI);
-    disp_state_stack._disp_index++;
-    disp_state_stack._disp_state[disp_state_stack._disp_index] = MOVE_MOTOR_UI;
-  }
-  disp_state = MOVE_MOTOR_UI;
-
-  scr = lv_screen_create();
-
-  (void)lv_label_create(scr, TITLE_XPOS, TITLE_YPOS, creat_title_text());
-
-  lv_refr_now(lv_refr_get_disp_refreshing());
-
   lv_obj_t *buttonXI = lv_big_button_create(scr, "F:/bmp_xAdd.bin", move_menu.x_add, INTERVAL_V, titleHeight, event_handler, ID_M_X_P);
   lv_obj_clear_protect(buttonXI, LV_PROTECT_FOLLOW);
   lv_big_button_create(scr, "F:/bmp_xDec.bin", move_menu.x_dec, INTERVAL_V, BTN_Y_PIXEL + INTERVAL_H + titleHeight, event_handler, ID_M_X_N);

Marlin/src/lcd/extui/lib/mks_ui/draw_number_key.cpp

@@ -662,17 +662,7 @@ static void event_handler(lv_obj_t *obj, lv_event_t event) {
 }
 
 void lv_draw_number_key(void) {
-  if (disp_state_stack._disp_state[disp_state_stack._disp_index] != NUMBER_KEY_UI) {
+  scr = lv_screen_create(NUMBER_KEY_UI, "");
-    disp_state_stack._disp_index++;
-    disp_state_stack._disp_state[disp_state_stack._disp_index] = NUMBER_KEY_UI;
-  }
-  disp_state = NUMBER_KEY_UI;
-
-  scr = lv_screen_create();
-
-  //(void)lv_label_create(scr, TITLE_XPOS, TITLE_YPOS, creat_title_text());
-
-  lv_refr_now(lv_refr_get_disp_refreshing());
 
   buttonValue = lv_btn_create(scr, 92, 40, 296, 40, event_handler, ID_NUM_KEY1, &style_num_text);
   labelValue = lv_label_create_empty(buttonValue);

Marlin/src/lcd/extui/lib/mks_ui/draw_operation.cpp

@@ -129,17 +129,7 @@ void lv_draw_operation(void) {
            *buttonBabyStep = nullptr, *label_BabyStep = nullptr,
            *label_Filament = nullptr;
 
-  if (disp_state_stack._disp_state[disp_state_stack._disp_index] != OPERATE_UI) {
+  scr = lv_screen_create(OPERATE_UI);
-    disp_state_stack._disp_index++;
-    disp_state_stack._disp_state[disp_state_stack._disp_index] = OPERATE_UI;
-  }
-  disp_state = OPERATE_UI;
-
-  scr = lv_screen_create();
-
-  (void)lv_label_create(scr, TITLE_XPOS, TITLE_YPOS, creat_title_text());
-
-  lv_refr_now(lv_refr_get_disp_refreshing());
 
   // Create image buttons
   lv_obj_t *buttonPreHeat  = lv_imgbtn_create(scr, "F:/bmp_temp.bin", INTERVAL_V, titleHeight, event_handler, ID_O_PRE_HEAT);

Marlin/src/lcd/extui/lib/mks_ui/draw_pause_position.cpp

@@ -65,15 +65,7 @@ static void event_handler(lv_obj_t *obj, lv_event_t event) {
 }
 
 void lv_draw_pause_position(void) {
-  if (disp_state_stack._disp_state[disp_state_stack._disp_index] != PAUSE_POS_UI) {
+  scr = lv_screen_create(PAUSE_POS_UI, machine_menu.PausePosText);
-    disp_state_stack._disp_index++;
-    disp_state_stack._disp_state[disp_state_stack._disp_index] = PAUSE_POS_UI;
-  }
-  disp_state = PAUSE_POS_UI;
-
-  scr = lv_screen_create();
-  (void)lv_label_create(scr, TITLE_XPOS, TITLE_YPOS, machine_menu.PausePosText);
-  lv_refr_now(lv_refr_get_disp_refreshing());
 
   sprintf_P(public_buf_l, PSTR("%.1f"), gCfgItems.pausePosX);
   lv_screen_menu_item_1_edit(scr, machine_menu.xPos, PARA_UI_POS_X, PARA_UI_POS_Y, event_handler, ID_PAUSE_X, 0, public_buf_l);

Marlin/src/lcd/extui/lib/mks_ui/draw_preHeat.cpp

@@ -158,17 +158,7 @@ static void event_handler(lv_obj_t *obj, lv_event_t event) {
 }
 
 void lv_draw_preHeat(void) {
-  if (disp_state_stack._disp_state[disp_state_stack._disp_index] != PRE_HEAT_UI) {
+  scr = lv_screen_create(PRE_HEAT_UI);
-    disp_state_stack._disp_index++;
-    disp_state_stack._disp_state[disp_state_stack._disp_index] = PRE_HEAT_UI;
-  }
-  disp_state = PRE_HEAT_UI;
-
-  scr = lv_screen_create();
-
-  (void)lv_label_create(scr, TITLE_XPOS, TITLE_YPOS, creat_title_text());
-
-  lv_refr_now(lv_refr_get_disp_refreshing());
 
   // Create image buttons
   lv_big_button_create(scr, "F:/bmp_Add.bin", preheat_menu.add, INTERVAL_V, titleHeight, event_handler, ID_P_ADD);

Marlin/src/lcd/extui/lib/mks_ui/draw_print_file.cpp

@@ -252,10 +252,7 @@ static char test_public_buf_l[40];
 void disp_gcode_icon(uint8_t file_num) {
   uint8_t i;
 
-  scr = lv_screen_create();
+  scr = lv_screen_create(MAIN_UI, "");
-  (void)lv_label_create(scr, TITLE_XPOS, TITLE_YPOS, creat_title_text());
-
-  lv_refr_now(lv_refr_get_disp_refreshing());
 
   // Create image buttons
   buttonPageUp   = lv_imgbtn_create(scr, "F:/bmp_pageUp.bin", OTHER_BTN_XPIEL * 3 + INTERVAL_V * 4, titleHeight, event_handler, ID_P_UP);

Marlin/src/lcd/extui/lib/mks_ui/draw_printing.cpp

@@ -121,15 +121,7 @@ static void event_handler(lv_obj_t *obj, lv_event_t event) {
 void lv_draw_printing(void) {
   disp_state_stack._disp_index = 0;
   ZERO(disp_state_stack._disp_state);
-  disp_state_stack._disp_state[disp_state_stack._disp_index] = PRINTING_UI;
+  scr = lv_screen_create(PRINTING_UI);
-
-  disp_state = PRINTING_UI;
-
-  scr = lv_screen_create();
-
-  (void)lv_label_create(scr, TITLE_XPOS, TITLE_YPOS, creat_title_text());
-
-  lv_refr_now(lv_refr_get_disp_refreshing());
 
   // Create image buttons
   lv_obj_t *buttonExt1 = lv_img_create(scr, nullptr);

Marlin/src/lcd/extui/lib/mks_ui/draw_ready_print.cpp

@@ -122,13 +122,8 @@ void lv_draw_ready_print(void) {
 
   disp_state_stack._disp_index = 0;
   ZERO(disp_state_stack._disp_state);
-  disp_state_stack._disp_state[disp_state_stack._disp_index] = PRINT_READY_UI;
+  scr = lv_screen_create(PRINT_READY_UI, "");
-
-  disp_state = PRINT_READY_UI;
-
-  scr = lv_screen_create();
   //lv_obj_set_hidden(scr, true);
-  lv_refr_now(lv_refr_get_disp_refreshing());
 
   if (mks_test_flag == 0x1E) {
     //(void)lv_label_create(scr, TITLE_XPOS, TITLE_YPOS, creat_title_text());

Marlin/src/lcd/extui/lib/mks_ui/draw_set.cpp

@@ -126,18 +126,7 @@ static void event_handler(lv_obj_t *obj, lv_event_t event) {
 }
 
 void lv_draw_set(void) {
-  if (disp_state_stack._disp_state[disp_state_stack._disp_index] != SET_UI) {
+  scr = lv_screen_create(SET_UI);
-    disp_state_stack._disp_index++;
-    disp_state_stack._disp_state[disp_state_stack._disp_index] = SET_UI;
-  }
-  disp_state = SET_UI;
-
-  scr = lv_screen_create();
-
-  (void)lv_label_create(scr, TITLE_XPOS, TITLE_YPOS, creat_title_text());
-
-  lv_refr_now(lv_refr_get_disp_refreshing());
-
   lv_big_button_create(scr, "F:/bmp_eeprom_settings.bin", set_menu.eepromSet, INTERVAL_V, titleHeight, event_handler, ID_S_EEPROM_SET);
   lv_big_button_create(scr, "F:/bmp_fan.bin", set_menu.fan, BTN_X_PIXEL + INTERVAL_V * 2, titleHeight, event_handler, ID_S_FAN);
   lv_big_button_create(scr, "F:/bmp_about.bin", set_menu.about, BTN_X_PIXEL * 2 + INTERVAL_V * 3, titleHeight, event_handler, ID_S_ABOUT);

Marlin/src/lcd/extui/lib/mks_ui/draw_step_settings.cpp

@@ -90,15 +90,7 @@ static void event_handler(lv_obj_t *obj, lv_event_t event) {
 }
 
 void lv_draw_step_settings(void) {
-  if (disp_state_stack._disp_state[disp_state_stack._disp_index] != STEPS_UI) {
+  scr = lv_screen_create(STEPS_UI, machine_menu.StepsConfTitle);
-    disp_state_stack._disp_index++;
-    disp_state_stack._disp_state[disp_state_stack._disp_index] = STEPS_UI;
-  }
-  disp_state = STEPS_UI;
-
-  scr = lv_screen_create();
-  (void)lv_label_create(scr, TITLE_XPOS, TITLE_YPOS, machine_menu.StepsConfTitle);
-  lv_refr_now(lv_refr_get_disp_refreshing());
 
   if (uiCfg.para_ui_page != 1) {
     sprintf_P(public_buf_l, PSTR("%.1f"), planner.settings.axis_steps_per_mm[X_AXIS]);

Marlin/src/lcd/extui/lib/mks_ui/draw_tmc_current_settings.cpp

@@ -103,15 +103,7 @@ static void event_handler(lv_obj_t *obj, lv_event_t event) {
 }
 
 void lv_draw_tmc_current_settings(void) {
-  if (disp_state_stack._disp_state[disp_state_stack._disp_index] != TMC_CURRENT_UI) {
+  scr = lv_screen_create(TMC_CURRENT_UI, machine_menu.TmcCurrentConfTitle);
-    disp_state_stack._disp_index++;
-    disp_state_stack._disp_state[disp_state_stack._disp_index] = TMC_CURRENT_UI;
-  }
-  disp_state = TMC_CURRENT_UI;
-
-  scr = lv_screen_create();
-  (void)lv_label_create(scr, TITLE_XPOS, TITLE_YPOS, machine_menu.TmcCurrentConfTitle);
-  lv_refr_now(lv_refr_get_disp_refreshing());
 
   float milliamps;
   if (uiCfg.para_ui_page != 1) {

Marlin/src/lcd/extui/lib/mks_ui/draw_tmc_step_mode_settings.cpp

@@ -112,15 +112,7 @@ static void event_handler(lv_obj_t *obj, lv_event_t event) {
 void lv_draw_tmc_step_mode_settings(void) {
   buttonXState = buttonYState = buttonZState = buttonE0State = buttonE1State = nullptr;
 
-  if (disp_state_stack._disp_state[disp_state_stack._disp_index] != TMC_MODE_UI) {
+  scr = lv_screen_create(TMC_MODE_UI, machine_menu.TmcStepModeConfTitle);
-    disp_state_stack._disp_index++;
-    disp_state_stack._disp_state[disp_state_stack._disp_index] = TMC_MODE_UI;
-  }
-  disp_state = TMC_MODE_UI;
-
-  scr = lv_screen_create();
-  (void)lv_label_create(scr, TITLE_XPOS, TITLE_YPOS, machine_menu.TmcStepModeConfTitle);
-  lv_refr_now(lv_refr_get_disp_refreshing());
 
   bool stealth_X = false, stealth_Y = false, stealth_Z = false, stealth_E0 = false, stealth_E1 = false;
   #if AXIS_HAS_STEALTHCHOP(X)

Marlin/src/lcd/extui/lib/mks_ui/draw_tool.cpp

@@ -99,24 +99,11 @@ static void event_handler(lv_obj_t *obj, lv_event_t event) {
 }
 
 void lv_draw_tool(void) {
-  if (disp_state_stack._disp_state[disp_state_stack._disp_index] != TOOL_UI) {
+  scr = lv_screen_create(TOOL_UI);
-    disp_state_stack._disp_index++;
-    disp_state_stack._disp_state[disp_state_stack._disp_index] = TOOL_UI;
-  }
-  disp_state = TOOL_UI;
-
-  scr = lv_screen_create();
-
-  (void)lv_label_create(scr, TITLE_XPOS, TITLE_YPOS, creat_title_text());
-
-  lv_refr_now(lv_refr_get_disp_refreshing());
-
   lv_big_button_create(scr, "F:/bmp_preHeat.bin", tool_menu.preheat, INTERVAL_V, titleHeight, event_handler, ID_T_PRE_HEAT);
   lv_big_button_create(scr, "F:/bmp_extruct.bin", tool_menu.extrude, BTN_X_PIXEL + INTERVAL_V * 2, titleHeight, event_handler, ID_T_EXTRUCT);
-
   lv_big_button_create(scr, "F:/bmp_mov.bin", tool_menu.move, BTN_X_PIXEL * 2 + INTERVAL_V * 3, titleHeight, event_handler, ID_T_MOV);
   lv_big_button_create(scr, "F:/bmp_zero.bin", tool_menu.home, BTN_X_PIXEL * 3 + INTERVAL_V * 4, titleHeight, event_handler, ID_T_HOME);
-
   lv_big_button_create(scr, "F:/bmp_leveling.bin", tool_menu.TERN(AUTO_BED_LEVELING_BILINEAR, autoleveling, leveling), INTERVAL_V, BTN_Y_PIXEL + INTERVAL_H + titleHeight, event_handler, ID_T_LEVELING);
   lv_big_button_create(scr, "F:/bmp_filamentchange.bin", tool_menu.filament, BTN_X_PIXEL+INTERVAL_V*2,BTN_Y_PIXEL+INTERVAL_H+titleHeight, event_handler,ID_T_FILAMENT);
   lv_big_button_create(scr, "F:/bmp_return.bin", common_menu.text_back, BTN_X_PIXEL * 3 + INTERVAL_V * 4, BTN_Y_PIXEL + INTERVAL_H + titleHeight, event_handler, ID_T_RETURN);

Marlin/src/lcd/extui/lib/mks_ui/draw_ui.cpp

@@ -1628,11 +1628,29 @@ void lv_btn_set_style_both(lv_obj_t *btn, lv_style_t *style) {
 }
 
 // Create a screen
-lv_obj_t* lv_screen_create() {
+lv_obj_t* lv_screen_create(DISP_STATE newScreenType, const char* title) {
   lv_obj_t *scr = lv_obj_create(nullptr, nullptr);
   lv_obj_set_style(scr, &tft_style_scr);
   lv_scr_load(scr);
   lv_obj_clean(scr);
+
+  // breadcrumbs
+  if (disp_state_stack._disp_state[disp_state_stack._disp_index] != newScreenType) {
+    disp_state_stack._disp_index++;
+    disp_state_stack._disp_state[disp_state_stack._disp_index] = newScreenType;
+  }
+  disp_state = newScreenType;
+  lv_refr_now(lv_refr_get_disp_refreshing());
+
+  // title
+  lv_obj_t *titleLabel = nullptr;
+  if (!title)
+    titleLabel = lv_label_create(scr, TITLE_XPOS, TITLE_YPOS, creat_title_text());
+  else if (title[0] != '\0')
+    titleLabel = lv_label_create(scr, TITLE_XPOS, TITLE_YPOS, title);
+  if (titleLabel)
+    lv_obj_set_style(titleLabel, &tft_style_label_rel);
+
   return scr;
 }
 

Marlin/src/lcd/extui/lib/mks_ui/draw_ui.h

@@ -468,7 +468,7 @@ void lv_btn_use_label_style(lv_obj_t *btn);
 void lv_btn_set_style_both(lv_obj_t *btn, lv_style_t *style);
 
 // Create a screen
-lv_obj_t* lv_screen_create();
+lv_obj_t* lv_screen_create(DISP_STATE newScreenType, const char* title = nullptr);
 
 // Create an empty label
 lv_obj_t* lv_label_create_empty(lv_obj_t *par);

Marlin/src/lcd/extui/lib/mks_ui/draw_wifi.cpp

@@ -58,17 +58,7 @@ static void event_handler(lv_obj_t *obj, lv_event_t event) {
 }
 
 void lv_draw_wifi(void) {
-  if (disp_state_stack._disp_state[disp_state_stack._disp_index] != WIFI_UI) {
+  scr = lv_screen_create(WIFI_UI);
-    disp_state_stack._disp_index++;
-    disp_state_stack._disp_state[disp_state_stack._disp_index] = WIFI_UI;
-  }
-  disp_state = WIFI_UI;
-
-  scr = lv_screen_create();
-
-  (void)lv_label_create(scr, TITLE_XPOS, TITLE_YPOS, creat_title_text());
-
-  lv_refr_now(lv_refr_get_disp_refreshing());
 
   // Create an Image button
   lv_obj_t *buttonBack = lv_imgbtn_create(scr, "F:/bmp_return.bin", BTN_X_PIXEL * 3 + INTERVAL_V * 4, BTN_Y_PIXEL + INTERVAL_H + titleHeight, event_handler, ID_W_RETURN);

Marlin/src/lcd/extui/lib/mks_ui/draw_wifi_list.cpp

@@ -89,17 +89,7 @@ static void event_handler(lv_obj_t *obj, lv_event_t event) {
 }
 
 void lv_draw_wifi_list(void) {
-  if (disp_state_stack._disp_state[disp_state_stack._disp_index] != WIFI_LIST_UI) {
+  scr = lv_screen_create(WIFI_LIST_UI);
-    disp_state_stack._disp_index++;
-    disp_state_stack._disp_state[disp_state_stack._disp_index] = WIFI_LIST_UI;
-  }
-  disp_state = WIFI_LIST_UI;
-
-  scr = lv_screen_create();
-
-  (void)lv_label_create(scr, TITLE_XPOS, TITLE_YPOS, creat_title_text());
-
-  lv_refr_now(lv_refr_get_disp_refreshing());
 
   lv_obj_t *buttonDown = lv_imgbtn_create(scr, "F:/bmp_pageDown.bin", OTHER_BTN_XPIEL * 3 + INTERVAL_V * 4, titleHeight + OTHER_BTN_YPIEL + INTERVAL_H, event_handler, ID_WL_DOWN);
   lv_obj_t *buttonBack = lv_imgbtn_create(scr, "F:/bmp_back.bin", OTHER_BTN_XPIEL * 3 + INTERVAL_V * 4, titleHeight + (OTHER_BTN_YPIEL + INTERVAL_H) * 2, event_handler, ID_WL_RETURN);

Marlin/src/lcd/extui/lib/mks_ui/draw_wifi_settings.cpp

@@ -94,17 +94,7 @@ static void event_handler(lv_obj_t *obj, lv_event_t event) {
 }
 
 void lv_draw_wifi_settings(void) {
-  if (disp_state_stack._disp_state[disp_state_stack._disp_index] != WIFI_SETTINGS_UI) {
+  scr = lv_screen_create(WIFI_SETTINGS_UI, machine_menu.WifiConfTitle);
-    disp_state_stack._disp_index++;
-    disp_state_stack._disp_state[disp_state_stack._disp_index] = WIFI_SETTINGS_UI;
-  }
-  disp_state = WIFI_SETTINGS_UI;
-
-  scr = lv_screen_create();
-
-  (void)lv_label_create(scr, TITLE_XPOS, TITLE_YPOS, machine_menu.WifiConfTitle);
-
-  lv_refr_now(lv_refr_get_disp_refreshing());
 
   lv_obj_t *labelModelText = lv_label_create(scr, PARA_UI_POS_X, PARA_UI_POS_Y + 10, machine_menu.wifiMode);
 

Marlin/src/lcd/extui/lib/mks_ui/draw_wifi_tips.cpp

@@ -39,14 +39,7 @@ tips_menu_def tips_menu;
 void lv_draw_wifi_tips(void) {
   static lv_obj_t *text_tips,*wifi_name;
 
-  if (disp_state_stack._disp_state[disp_state_stack._disp_index] != WIFI_TIPS_UI) {
+  scr = lv_screen_create(WIFI_TIPS_UI, "");
-    disp_state_stack._disp_index++;
-    disp_state_stack._disp_state[disp_state_stack._disp_index] = WIFI_TIPS_UI;
-  }
-  disp_state = WIFI_TIPS_UI;
-
-  scr = lv_screen_create();
-  lv_refr_now(lv_refr_get_disp_refreshing());
 
   wifi_name = lv_label_create(scr, (const char *)wifi_list.wifiName[wifi_list.nameIndex]);
   lv_obj_align(wifi_name, nullptr, LV_ALIGN_CENTER, 0, -20);

Marlin/src/lcd/extui/lib/mks_ui/wifiSerial.cpp

@@ -53,7 +53,7 @@ WifiSerial::WifiSerial(usart_dev *usart_device, uint8 tx_pin, uint8 rx_pin) {
   /* F1 MCUs have no GPIO_AFR[HL], so turn off PWM if there's a conflict
    * on this GPIO bit. */
   static void disable_timer_if_necessary(timer_dev *dev, uint8 ch) {
-    if (dev != nullptr) timer_set_mode(dev, ch, TIMER_DISABLED);
+    if (dev) timer_set_mode(dev, ch, TIMER_DISABLED);
   }
 #elif STM32_MCU_SERIES == STM32_SERIES_F2 || STM32_MCU_SERIES == STM32_SERIES_F4
   #define disable_timer_if_necessary(dev, ch) ((void)0)

Marlin/src/lcd/extui/lib/mks_ui/wifi_upload.cpp

@@ -533,12 +533,8 @@ EspUploadResult flashFinish(signed char reboot) {
 
 // Compute the checksum of a block of data
 uint16_t checksum(const uint8_t *data, uint16_t dataLen, uint16_t cksum) {
-  if (data != nullptr) {
+  if (data) while (dataLen--) cksum ^= (uint16_t)*data++;
-    while (dataLen--) {
+  return cksum;
-      cksum ^= (uint16_t)*data++;
-    }
-  }
-  return(cksum);
 }
 
 EspUploadResult flashWriteBlock(uint16_t flashParmVal, uint16_t flashParmMask) {